virtio — archive

RE: [EXT] [virtio] [PATCH requirements 2/7] net-features: Add low latency transmit queue requirements

From: Parav Pandit
To: [email protected]
Date: Tue, 15 Aug 2023 05:52:00 -0000

> From: Satananda Burla <[email protected]> > Sent: Friday, August 11, 2023 12:35 AM > > +6. Ability to zero pad the transmit completion when the transmit > > completion is > > + shorter than the CPU cache line size. > Did you mean that the last completion in a cache line will be padded ? > For ex if a transmit completion is 16 byte, you could fit 4 of them into a > cacheline. But if device has got only 3 completions to post, it would post > 3 and pad the last 16 bytes. Right. Device can choose to pad last in above example. If 2 completions are written, it can still choose to pad remaining 2. > I hope you did not mean that every transmit > completion is padded to cacheline size. Right, I didn't mean that. David had better wording to describe this. So I will use his suggestion.